<template>
	<view>
		<!-- 懒加载动画 -->
		<view class="loading-box">
		  <u-loading :show="loadingone" color="#41ADBA" size="70"></u-loading>
		</view>
		<view class="u-wrap" v-show="!loadingone">
			<navbar name="按部位查"></navbar>
			<view class="tabsView">
				<u-tabs height="100" bg-color="#fff" font-size="30rpx" bar-width="80" active-color="#2EA7E0" :list="list"
					:is-scroll="true" :current="current" @change="change"></u-tabs>
			</view>
			<!-- <view class="u-search-box">
				<view class="u-search-inner">
					<u-icon name="search" color="#909399" :size="28"></u-icon>
					<text class="u-search-text">搜索uView</text>
				</view>
			</view> -->
			<view class="u-menu-wrap">
				<scroll-view scroll-y scroll-with-animation class="u-tab-view menu-scroll-view" :scroll-top="scrollTop">
					<view v-for="(item,index) in tabbar" :key="index" class="u-tab-item"
						:class="[current==index ? 'u-tab-item-active' : '']" :data-current="index"
						@tap.stop="swichMenu(index)">
						<text class="u-line-1">{{item.name}}</text>
					</view>
				</scroll-view>
				<block v-for="(item,index) in tabbar" :key="index">
					<scroll-view scroll-y class="right-box" v-if="current==index">
						<view class="page-view">
							<view class="class-item">
								<view class="item-title">
									<text>{{item.name}}</text>
								</view>
								<view class="item-container">
									<view class="thumb-box" v-for="(item1, index1) in item.foods" :key="index1">
										<!-- <image class="item-menu-image" :src="item1.icon" mode=""></image> -->
										<view class="item-menu-name">{{item1.name}}</view>
									</view>
								</view>
							</view>
							<view class="class-item">
								<view class="item-title">
									<text>{{item.name2}}</text>
								</view>
								<view class="item-container">
									<view class="thumb-box" v-for="(item1, index1) in item.else" :key="index1">
										<!-- <image class="item-menu-image" :src="item1.icon" mode=""></image> -->
										<view class="item-menu-name">{{item1.name}}</view>
									</view>
								</view>
							</view>
						</view>
					</scroll-view>
				</block>
			</view>
		</view>
	</view>
</template>

<script>
import uLoading from "@/uview-ui/components/u-loading/u-loading.vue"

import uTabs from "@/uview-ui/components/u-tabs/u-tabs.vue"

import uIcon from "@/uview-ui/components/u-icon/u-icon.vue"

	import classifyData from "@/common/classify.data.js";
	export default {
		components: {
			uLoading,
			uTabs,
			uIcon
		},
		data() {
			return {
				loadingone:false,//懒加载
				list: [],
				current: 0,
				sectionCurrent: 0,
				tabbar: classifyData,
				scrollTop: 0, //tab标题的滚动条位置
				current: 0, // 预设当前项的值
				menuHeight: 0, // 左边菜单的高度
				menuItemHeight: 0, // 左边菜单item的高度
			}
		},
		computed: {

		},
		methods: {
			getImg() {
				return Math.floor(Math.random() * 35);
			},
			// 点击左边的栏目切换
			async swichMenu(index) {
				if (index == this.current) return;
				this.current = index;
				// 如果为0，意味着尚未初始化
				if (this.menuHeight == 0 || this.menuItemHeight == 0) {
					await this.getElRect('menu-scroll-view', 'menuHeight');
					await this.getElRect('u-tab-item', 'menuItemHeight');
				}
				// 将菜单菜单活动item垂直居中
				this.scrollTop = index * this.menuItemHeight + this.menuItemHeight / 2 - this.menuHeight / 2;
			},
			// 获取一个目标元素的高度
			getElRect(elClass, dataVal) {
				new Promise((resolve, reject) => {
					const query = uni.createSelectorQuery().in(this);
					query.select('.' + elClass).fields({
						size: true
					}, res => {
						// 如果节点尚未生成，res值为null，循环调用执行
						if (!res) {
							setTimeout(() => {
								this.getElRect(elClass);
							}, 10);
							return;
						}
						this[dataVal] = res.height;
					}).exec();
				})
			}
		}
	}
</script>

<style lang="scss" scoped>
	.u-wrap {
		height: calc(100vh);
		/* #ifdef H5 */
		height: calc(100vh - var(--window-top));
		/* #endif */
		display: flex;
		flex-direction: column;
	}

	.u-menu-wrap {
		flex: 1;
		display: flex;
		overflow: hidden;
	}

	.u-tab-view {
		width: 200rpx;
		height: 100%;
	}

	.u-tab-item {
		height: 110rpx;
		background: #f6f6f6;
		box-sizing: border-box;
		display: flex;
		align-items: center;
		justify-content: center;
		font-size: 26rpx;
		color: #444;
		font-weight: 400;
		line-height: 1;
	}

	.u-tab-item-active {
		position: relative;
		color: #000;
		font-size: 30rpx;
		font-weight: 600;
		background: #fff;
	}

	.u-tab-item-active::before {
		content: "";
		position: absolute;
		width: 9upx;
		height: 36upx;
		background: #2EA7E0;
		border-radius: 5upx;
		left: 0;
		top: 39rpx;
	}

	.u-tab-view {
		height: 100%;
	}

	.right-box {
		background-color: rgb(250, 250, 250);
	}

	.page-view {
		// padding: 16rpx;
		background: #fff;
		height: 1300upx;
	}

	.class-item {
		margin-bottom: 30rpx;
		background-color: #fff;
		padding: 16rpx;
		border-radius: 8rpx;
	}

	.item-title {
		font-size: 30upx;
		font-weight: bold;
		color: #333333;
		line-height: 42upx;
		padding-left: 60upx;
		position: relative;
	}

	.item-title::before {
		content: '';
		position: absolute;
		top: 4upx;
		left: 4upx;
		width: 10upx;
		height: 30upx;
		background: #2EA7E0;
		border-radius: 5upx;
	}
	.item-menu-name {
		font-size: 24upx;
		font-weight: 400;
		color: #9B9B9B;
		line-height: 60upx;
		letter-spacing: 1upx;
	}

	.item-container {
		display: flex;
		flex-wrap: wrap;
	}

	.thumb-box {
		width: 33.333333%;
		display: flex;
		align-items: center;
		justify-content: center;
		flex-direction: column;
		margin-top: 20rpx;
	}

	.item-menu-image {
		width: 120rpx;
		height: 120rpx;
	}

	.tabsView {
		background: #F5F5F5;
	}
</style>
